What are you trying to do? In High Sierra local snapshots are created more often than previously. Have a look at support.apple.com/en-us/HT204015. Use TimeMachine to remove local snapshots so you don't shoot yourself in the foot with a bazooka.
– flindebergDec 12 '17 at 13:00

I am on MacOS Mojave and I don't see the /Volumes/com.apple.TimeMachine.localsnapshots folder in /Volumes (even as root in Terminal) so I think this has been changed in Mojave.
– TurribeachFeb 14 '19 at 11:53